Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites
Mn–Ti, Zn–Ti, Zn–Zr substituted M-type Sr-hexaferrites (SrM), SrFe<sub>12−2x</sub>M<sub>1<i>x</i></sub>M<sub>2<i>x</i></sub>O<sub>19</sub> (0 ≤ <i>x ≤</i> 2.0, M<sub>1</sub> = Mn or Zn; M<sub>2</...
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MDPI AG
2021-09-01
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| Online Access: | https://www.mdpi.com/2076-3417/11/18/8669 |
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| author | Jae-Uk Kim Young-Min Kang |
| author_facet | Jae-Uk Kim Young-Min Kang |
| author_sort | Jae-Uk Kim |
| collection | DOAJ |
| description | Mn–Ti, Zn–Ti, Zn–Zr substituted M-type Sr-hexaferrites (SrM), SrFe<sub>12−2x</sub>M<sub>1<i>x</i></sub>M<sub>2<i>x</i></sub>O<sub>19</sub> (0 ≤ <i>x ≤</i> 2.0, M<sub>1</sub> = Mn or Zn; M<sub>2</sub> = Ti or Zr) were synthesized, and their solubility, crystalline structure, and high-frequency properties were studied. Zn–Zr substitution caused a relatively large lattice parameter change and resulted in lower solubility (<i>x ≤</i> 1.0) in the M-type phase compared with Mn–Ti and Zn–Ti substitutions. However, the ferromagnetic resonance frequency (<i>f<sub>FMR</sub></i>) effectively decreased with increasing <i>x</i> in SrFe<sub>12−2x</sub>Zn<i><sub>x</sub></i>Zr<i><sub>x</sub></i>O<sub>19</sub> (Zn–Zr:SrM) (0 ≤ <i>x ≤</i> 1.0) and the electromagnetic wave (EM) absorption frequency also varied according to the shift in <i>f<sub>FMR</sub></i> in the 7–18 GHz range. This is attributed to a gradual decrease in the magnetocrystalline anisotropy of Zn–Zr:SrM (0 ≤ <i>x ≤</i> 1.0) with an increase in <i>x</i>. Zn–Zr:SrM (<i>x</i> = 0.9)–epoxy(10 wt%) composites exhibited a high EM absorption in the X-band (8–12 GHz) with the lowest reflection loss of <−45 dB. The sample with <i>x</i> = 0.8 showed a broad Ku band (12–18 GHz) absorption performance satisfying RL <−19 dB at 11 ≤ <i>f ≤</i> 18 GHz. |
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| language | English |
| last_indexed | 2024-03-10T07:55:11Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-753d5eb616534832aae7a8769fe1e6d72023-11-22T11:56:23ZengMDPI AGApplied Sciences2076-34172021-09-011118866910.3390/app11188669Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-HexaferritesJae-Uk Kim0Young-Min Kang1Department of Materials Science & Engineering, Korea National University of Transportation, Chungju 27469, KoreaDepartment of Materials Science & Engineering, Korea National University of Transportation, Chungju 27469, KoreaMn–Ti, Zn–Ti, Zn–Zr substituted M-type Sr-hexaferrites (SrM), SrFe<sub>12−2x</sub>M<sub>1<i>x</i></sub>M<sub>2<i>x</i></sub>O<sub>19</sub> (0 ≤ <i>x ≤</i> 2.0, M<sub>1</sub> = Mn or Zn; M<sub>2</sub> = Ti or Zr) were synthesized, and their solubility, crystalline structure, and high-frequency properties were studied. Zn–Zr substitution caused a relatively large lattice parameter change and resulted in lower solubility (<i>x ≤</i> 1.0) in the M-type phase compared with Mn–Ti and Zn–Ti substitutions. However, the ferromagnetic resonance frequency (<i>f<sub>FMR</sub></i>) effectively decreased with increasing <i>x</i> in SrFe<sub>12−2x</sub>Zn<i><sub>x</sub></i>Zr<i><sub>x</sub></i>O<sub>19</sub> (Zn–Zr:SrM) (0 ≤ <i>x ≤</i> 1.0) and the electromagnetic wave (EM) absorption frequency also varied according to the shift in <i>f<sub>FMR</sub></i> in the 7–18 GHz range. This is attributed to a gradual decrease in the magnetocrystalline anisotropy of Zn–Zr:SrM (0 ≤ <i>x ≤</i> 1.0) with an increase in <i>x</i>. Zn–Zr:SrM (<i>x</i> = 0.9)–epoxy(10 wt%) composites exhibited a high EM absorption in the X-band (8–12 GHz) with the lowest reflection loss of <−45 dB. The sample with <i>x</i> = 0.8 showed a broad Ku band (12–18 GHz) absorption performance satisfying RL <−19 dB at 11 ≤ <i>f ≤</i> 18 GHz.https://www.mdpi.com/2076-3417/11/18/8669hexaferritepermittivitypermeabilityferromagnetic resonancereflection lossEM absorption |
| spellingShingle | Jae-Uk Kim Young-Min Kang Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites Applied Sciences hexaferrite permittivity permeability ferromagnetic resonance reflection loss EM absorption |
| title | Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites |
| title_full | Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites |
| title_fullStr | Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites |
| title_full_unstemmed | Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites |
| title_short | Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of M<sub>1</sub><sup>2+</sup>–M<sub>2</sub><sup>4+</sup> Substituted M-Type Sr-Hexaferrites |
| title_sort | synthesis characterization and electromagnetic wave absorbing properties of m sub 1 sub sup 2 sup m sub 2 sub sup 4 sup substituted m type sr hexaferrites |
| topic | hexaferrite permittivity permeability ferromagnetic resonance reflection loss EM absorption |
| url | https://www.mdpi.com/2076-3417/11/18/8669 |
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